#898: bug with interp2d
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Reporter: jlm | Owner: pv
Type: defect | Status: closed
Priority: normal | Milestone: Unscheduled
Component: scipy.interpolate | Version: 0.7.0
Resolution: wontfix | Keywords: interp2d, linear
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Changes (by pv):
* status: new => closed
* resolution: => wontfix
Comment:
I looked at this again: the issue appears to be that the knot selection in
FITPACK is not necessarily symmetric around the center even if the data
is. The 'linear' interpolation in FITPACK in any case means that the
interpolation is linear between knots (which are selected to lie somewhere
in the region), and not between data points.
I don't think we want to modify FITPACK to enforce such symmetry. So, I
don't think there is anything to fix in the present behavior, although at
first sight it does seem rather strange.
However, in the future interp2d probably will use a more robust approach
for interpolation when the original data is gridded, which does not have
these problems: https://github.com/scipy/scipy/pull/353
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Ticket URL: <http://projects.scipy.org/scipy/ticket/898#comment:4>
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